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WebControlled-Light.ino
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#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
int lcdColumns = 16;
int lcdRows = 2;
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);
// Add wifi access point credentiaals
const char* ssid = "abcd";
const char* password = "ZXCV@098";
WiFiServer server(80);// Set port to 80
String header; // This storees the HTTP request
// Declare the pins to which the appliances are connected via relays
int app1 =15; //GPIO15(D8)-appliance 1
int app2 =12; //GPIO12(D4)-appliance 2
//you can add more more appliances below.
String app1state = "off";// state of appliance1
String app2state = "off";// state of appliance1
void setup() {
Serial.begin(115200);
lcd.init();
// turn on LCD backlight
lcd.backlight();
//Use predefined PINS consts
pinMode(app1, OUTPUT);
digitalWrite(app1,LOW);
pinMode(app2,OUTPUT);
digitalWrite(app2,LOW);
//connect to access point
WiFi.begin(ssid, password);
Serial.print("Connecting to ");
Serial.println(ssid);
delay(1000);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
lcd.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("IP address: ");
delay(1000);
Serial.println(WiFi.localIP());// this will display the Ip address of the Pi which should be entered into your browser
lcd.setCursor(0,0);
lcd.print("IP address: ");
lcd.setCursor(0,1);
lcd.print(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /app1/on") >= 0) {
app1state = "on";
digitalWrite(app1,HIGH);
} else if (header.indexOf("GET /app1/off") >= 0) {
app1state = "off";
digitalWrite(app1,LOW);
} else if (header.indexOf("GET /app2/on") >= 0) {
app2state = "on";
digitalWrite(app2,HIGH);
} else if (header.indexOf("GET /app2/off") >= 0) {
app2state = "off";
digitalWrite(app2,LOW);
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #77878A;}</style></head>");
// Web Page Heading
client.println("<body><h1>ESP8266 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("<p>app1 - State " + app1state + "</p>");
// If Appliance 1 is off, it displays the ON button
if (app1state == "off") {
client.println("<p><a href=\"/app1/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/app1/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>app2 - State " + app2state + "</p>");
// If Appliance 2 is off, it displays the ON button
if (app2state == "off") {
client.println("<p><a href=\"/app2/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/app2/off\"><button class=\"button button2\">OFF</button></a></p>");
}
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}